Rigid stud compression connecter



Aug. 9, 1932. J. E. SUMPTER ET AL RIGID STUD COMPRESSION CONNECTER Filed Dec. 15, 1928 John E. Sum/ ater fllfwd Jfisalw Patented Aug. 9, 1932 UNITED STATES PATENT OFFICE)" JOHN E. SUMPTER, OF MINNEAPOLIS, MINNESOTA, AND ALFRED ALSAKER, OF CHICAGO, ILLINOIS, ASSIGNORS TO DELTA-STAR ELECTRIC COMPANY, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS RIGID STUD COMPRESSION CONNECTEB Application filed December is, 1928. Serial No. 325,755.

()ur invention relates to a rigid stud compression connecter designed to provide a sturdy, strong and full contacting connecter which provides means so that a connection may be made at the end of a wire cable or conductor cable to insure a full and substantial contact by the connecter.

' It is a feature of our invention to provide a light, easily installed connecter for con necting copper cables or wires to equipment studs. The connecter is designed with a base member in which a recess is. formed and threaded to receive the equipment stud.

It is also a feature of our connecter to provide a simple designed member "which forms the base having a substantial formation with two guide lugs projecting from one side of the same upwardly toward the top of the connecter. The base plate of the compressor connecter is formed with a heavy substantially constructed upwardly projecting screw member or threaded bolt,which is adapted to receive the compressor plate over the same.

The compressor plate is formed in a manner to provide an inwardly converging surface so that when the compressor plate is placed over the threaded bolt and a nut is drawn down on the threaded bolt against the com pressor plate, the inwardly slanting surface of the compressor plate causes the copper cable being connected to the bolt and connecter to be compressed toward the bolt. Thus the loop of the cable instead of being spread away from the bolt is drawn toward the bolt to make a substantial connection.

Projecting from the base, the guide lugs which we have set forth, guide the end of the cable as it is laid around the attaching bolt with the cable extending between the guide lugs.

It is a feature to provide the compression plate with a projecting lip on one side of the same which extends between the guide lugs and thus forms a means ofpassing over the end of the cable which projectsoutside of the guide lugs and also over the extendinglpon' tion of the cable to hold the same firmly between the lugs. This guiding lip also holds thecompressor plate against'rotation when the operating nut is screwed down against the same. The compression plate is formed wlth a concaved inner surface so as to-fit over the sides of the cable and compress it .closely 7 around theattaching bolt. By compressing.

the cable closely around the attaching bolt a good and substantial electrical, contact is made. 7

The connection of the compressor connecter to the rigidstud is so designedthat-the re-..,

cess for receiving the stud extendsup into the parts come closely together,a feature which is desirable in electrical connecters'of thls nature.

These features together with other details and objects will be more fully and clearly set forth in the specification and claims. In the drawing: i 77 i Figure 1 is a plan view of 'ourgrigid stud compressor connecter, showing the connection with a copper electrical cable indotted.

outline. 7 V j 7 Figure 2 is a side view of the compressor connector. I

' Figure 3 is a front view the guide lugs. I

looking toward In the drawing our compressionconnecter A is provided with a base portion B ofa substantial, strong nature. The base 'is provided with a horizontally disposed base plate 10 fromwhich' projects the threaded attach-J ing bolt 11. This threaded bolt 11 is formed" integral at the base plate lO'and'has a lower non-threaded smooth portion 12 about which the connecting cable is wound.

' The' base plate 10 is semi-circularon one side at 13 and the other 'side of the same ex tends with parallel 'sides 14 to form thesquared end 15which projects at substantially right angles to th e side 14'. i In thismann'er a square "projection iformed on the plate '10. Projecting upwardly from'the corners of thisprojecting portion of *the plate 10, we provideguide lugs 16 which are formed integral with the base B or plateportion 10. :1 V

When the cable, suchas is. illustrated in We provide a compressor plate for'our rigidstud compressor connecter. A suchias the plate 18, which is formed with a central opening so that it will slide freely over the bolt 11. This compressor plate 18has' a concaved inner surface which extends ine wardly from the outer periphery '19 ofthe plate 18, as illustrated by the dotted lines 20 so that the concave of the inner surface of the plate 18 issimilar to theouter slanting surface ofthe top of the plate, as illustrated in Figures 2 and This plate may be 'formedby first stamping it out of a flat sheet and pressing it so that the sides will slant or bevel from the center toward; the outside and thusform aconcaved inner surface which is, adapted'toengage over the cable, such as C,

.;-when the same is wrapped about the bolt 11.

f The compressor plate 18 isformed with a projecting lip 21 which extendsbetween the guide lugs 16. c This lip holds the plate 18 from turning when the; nut 22 which is threaded, on the bolt 11 is brought down against the plate 18.

compressor plate 18 down rigidly and tightly against the cable C, causing the cable to be forced toward, the bolt ll'to provide a means. of compressing the cable tightly against the bolt and thereby forming a very substantial electrical connection.

. the, plate'10 and into the bolt 11,-the equipa threaded recess which extends up through ment stud E can be attached to the connecter A. viBy suitable nuts 25 the equipment stud E can be locked rigidly connected to the cone necter A and clamping the connecter A to the barD. T a i 5 The compact simple construction of our rigid stud compression connecter is of pri- The internal design of mary importance. the parts and the compression plate which causes the cable to be squeezed tightly around the connecter or rigid stud 11 1 provides a means of electrical connection wherein aT'good and. substantial contactis maintained by the from the spirit of our invention. ;l i We'claim-z'f The nut 22 clamps the,

The base plateiB is formed comparatively" flat on its under side so as to be connected to aplate-orbar, such .asD, and by means of 1. A rigid stud compressor connecter including, a base plate, a threaded rigid stud integrally projecting from said plate, one side of said plate being squared, a pair of guide lugs projecting from thecorners of said squared side, a concaved compressor plate adapted to freely slide over said rigid stud, a nut for tightening said compressor plate, and a recess extending into said base plate and rigid stud .foran equipment stud connection.

2. An electrical connecter including, a base, a semi-cylindrical side on said plate, a squared projecting oppositely disposed side on said plate, guide lugs projecting upwardly "from said squared portion, a compressor plate, a rigid stud integrallyprojecting from said base plate over' which said compressor plate .is adaptedito fit, a guide lip formed on said compressor plate adapted to extendibesaid plate, a squaredright-angularly projectlng side opposltely disposed from said first side, slde lugs projecting upwardly from said right-angular projecting portion, "a rigidthreaded-stud projecting centrally from said base portion, acompression platehaving a i v eluding, a base plate, asemi-circular side on guide lip adapted to slidelbetween said guide lugs,anda nutthreaded tosa'id rigidstudto cause saidcompressor'plate to compress a connecter electr cal cable against said stud" when extendedin the loop around ,th'el same and extending between said guide lugs. Q

i 4;. .Arigid stud compression connecter comprising, a horizontallydisposed-base plate, guide lugs projectingupwardly from one side .ofgsaid Lloasevv plate, a rigid stud integrally formed-projectingcentrally from said base i plate having' a threadedformation, aithre'ad- Jed recess extending through'said'ba'se plate into said rigidstud, a compressor plate. having a curved concavedinner surface and an opening forvsaid rigid stud and adapted to v.slideably fit over the same, and a nut for engaging said rigid'stud tocause said compressor plate to squeeze an electrical cable tightly aboutsaid stud when said compressor plate is forced down toward said base by said nut.

75. A connecter for, electrical cables comprising, a heavy, broad base plate, a iigidin itegral stud projecting upwardly from said base plate having; anoute'r threaded formation,a compressionplateadapted to slide- 1ably fitover saidstud, a nut for operating said compression plate into operative 'posi: .tion toward said base plate to clamp an electrical cable between said'base plate and compressor plate, 'as said:compression plate is forced; toward saidbaseplate, means on said 7 v oompressiongplate for'wedging the cable in wardly, and means in said base plate co-operating with said compression plate to guide said compression plate and to form a guide and shoulder for an electric cable wound about said rigid stud to hold the end of the cable closely around said stud and between said guiding means.

6. A rigid stud compression connecter including, a broad, fiat base plate, an integrally formed upwardly projecting threaded connecter stud, a compression plate adapted to freely slide over said connecter stud, a nut for locking said compression plate over acable to connect and compress the same about said rigid stud, means on said compression plate for wedging said cable against said stud as the same is urged downwardly by said nut, means formed on said base plate and compressor plate co-operating with the side to prevent rotation of said compressor plate, and means for connecting said connecter and said base plate to an equipment stud and bar.

JOHN E. SUMPTER. ALFRED ALSAKER. 

